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The Lobed-Leaf Phenotype in Brassica juncea Is Associated with the BjLMI1 Locus as Evidenced Using GradedPool-Seq

文献类型： 外文期刊

作者： Fu, Wen-Yuan 1 ; Teng, Jiu-Cui 1 ; Tang, Bing 1 ; Wang, Qing-Qing 1 ; Yang, Wei 1 ; Tao, Lian 1 ; Wan, Zheng-Jie 2 ; Wu, Kang-Yun 3 ; Tan, Guo-Fei 1 ; Deng, Ying 1 ;

作者机构： 1.Guizhou Acad Agr Sci, Inst Hort, Guiyang 550006, Peoples R China

2.Huazhong Agr Univ, Coll Hort & Forestry, Key Lab Hort Plant Biol, Minist Educ, Wuhan 430070, Peoples R China

3.Guizhou Acad Agr Sci, Inst Sericulture Pepper, Guiyang 550006, Peoples R China

关键词： Brassica juncea; GradedPool-Seq; BjLMI1; leaf phenotype; expression analysis

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 11 期

页码：

收录情况： SCI

摘要： The shape of the leaf is the primary phenotype which determines the commercial value of leaf mustard (Brassica juncea). However, there arefew reports on the lobed-leaf gene of B. juncea, and the molecular regulatory mechanisms underlying leaf margin formation are unknown. In this study, an F-2 population derived from 'MN001' and 'MU056' was constructed. Genetic analysis revealed that the lobed-leaf trait is controlled by a major gene, and lobed leavesare dominant compared to round leaves. The GradedPool-Seq analysis combined with the re-sequencing results of parents identified a major interval on chromosome 10 of B. juncea's genome A. The BjLMI1 gene (BjuA040054) was confirmed to be a candidate gene by gene ontology (GO) analysis, and it is homologous with LMI1 and encodes HD-Zip protein ATHB-51. A base substitution was observed in the conserved domain, and a 63 bp fragment deletion was found in the exon region between the two parents in the CDs region. The expression of BjLMI1 was significantly higher in the lobed-leaf parent than in the round-leaf parent. These findings provide insights into the molecular mechanism underlying leaf margin formation and will be valuable in the development of an ideal leaf shape in B. juncea.

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